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Environmental Engineering

Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + DWF
Rainfall + 6 DWF
Rainfall + 2 DWF
Equal to rainfall

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Environmental Engineering
The amount of coagulant needed for coagulation of water increases with (i) Increase in turbidity of water (ii) Decrease in turbidity of water (iii) Increase in temperature of water (iv) Decrease in temperature of water The correct answer is

(i) and (ii)
(ii) and (iii)
(i)and(iv)
(ii) and (iv)

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Environmental Engineering
The percentage of chlorine in fresh bleaching powder is about

30 to 35
40 to 50
20 to 25
10 to 15

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Environmental Engineering
In facultative stabilization pond, the sewage is treated by

Aerobic bacteria only
Sedimentation
Dual action of aerobic bacteria and anaerobic bacteria
Algae only

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Environmental Engineering
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

Total hardness
Non carbonate hardness
Total hardness total alkalinity
Total alkalinity

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Environmental Engineering
The detention period in coagulation tanks is usually kept as

30 to 45 minutes
1 to 2 minutes
2 to 6 days
2 to 6 hours

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